JPH0246370A - Sealing piece - Google Patents

Abstract

PURPOSE: To attain fixed sealing in the seated position of an annular metal plate part by providing a protruding part at the inner end part of a leg, turned in an axial direction, of the annular metal plate part provided with hermetic coating, and engaging this protruding part with a groove on the opposite side. CONSTITUTION: A second metal plate ring 3 is provided with hermetic coating 6 at the peripheral surface of a leg 3' so as to attain airtight closeout to a shaft 5. In order to prevent the hermetic coating 6 from being scraped off at the time of assembling the metal plate ring 3, a radial protruding part 7 is integrally formed at the inner end part of the leg 3'. This protruding part 7 enlarges the diameter of the leg 3' provided with the hermetic coating 6 during assembly. The hermetic coating 6 is not pressed to the shaft 5 until the protruding part 7 is engaged with a groove 8 of the shaft 5, and the protruding part 7 closes a possible clearance depending on occasions. After the protruding part 7 is fitted into the grove 8, the metal plate ring 3 is axially fixed onto the shaft 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a sealing ring according to the preamble of claim 1, in particular for a rolling bearing.

[Conventional technology]

The requirements for the sealing of rolling bearings have become more sophisticated over time. A series of very well-functioning sealing rings has therefore already been developed. Such arrangements, commonly referred to as cassette seals, often close so well that air pressure equilibrium is no longer possible. However, the negative or positive pressure generated, for example by heating or cooling, acts in such a way that a frequent pressure equalization takes place not on the sealing gap, but through the respective seating position of the closed M-ring. However, in this case there is a great risk that moisture and dirt will enter the bearing space.

To avoid this, there are already a number of proposals in which the sealing ring is also provided with a sealing device in the form of a plastic covering layer in the seating position. For economic reasons, this is done in particular in those parts of the two-part sealing piece, which must be provided with a sealing lip by means of adhesive bonding. This part has a sealing lip and a plastic covering layer in the seating position. Such an arrangement can be seen, for example, from German Patent Application No. 3320063. In this case, for reasons of cost, the second part of the sealing piece does not have a vulcanized plastic coating. In this case, the only advantage is a rectangular metal plate that can be easily manufactured. However, in this case, there is a risk of leakage occurring at the seating position of the simple rectangular metal plate.

A simple solution to this problem consists in providing a plastic layer at this location as well. Such an arrangement is shown, for example, in DE 31 03 319 A1. However, this configuration has several drawbacks. First of all, this second part must also be provided with a vulcanizate-bonded layer in an expensive manner. On the other hand, however, the plastic coating layer may be scraped off when the ring is fitted onto the opposite side, so that it may not be possible to ensure complete integration of the sealing piece.

[Problem to be solved by the invention]

The object of the invention is to improve a sealing piece of the generic type in such a way that a good and fixed sealing of simple metal plate parts is achieved in the seated position of these metal plate parts. .

[Means to solve the problem]

The problem is that the at least one plastic coating layer consists of a sealing coating and that the inner end of the axially oriented leg of the annular metal plate part with the sealing coating is provided with a projection, which projection This problem is solved by being engaged with a groove in the opposite part. Claim 2 describes a preferred configuration.

The axially oriented leg of the metal plate part to be mounted has at its free end a protrusion which later engages in a groove in the shaft or housing, so that this ring is first of all well aligned in the axial direction. It is achieved that it is fixed. A sealing coating is applied to the following cylindrical surface area, which is protected by the aforementioned projection during assembly. This is because this sealing coating does not come into contact with the opposing surface. The diameter of the cylindrical surface section changes only when the protrusion of the metal plate section engages the groove. As a result, the sealing coating comes into contact with the facing surface and seals any possible gaps at this point in an air-tight manner. In this case, the sealing coating can be simply applied to the rectangular tapered ring, for example by spraying or smearing.

This is clearly a very advantageous configuration for assembly and sealing.

The sealing ring has a protrusion at the inner end of the metal plate part,
It is known from DE 33 20 063 A1, however, that this protrusion consists of a number of tongues with a free space between them, so that in any case there is no need for a closed plastic part. Such vulcanization bonding must be performed.

Preferably, the sealing coating is thinner than the radial protrusion of the metal plate portion. With that, the painting! ! ! ! This reliably prevents the seal from being scraped off during assembly.

〔Example〕

The invention will be explained in more detail with the help of two figures.

According to FIG. 1, the sealing piece consists of a first L-shaped metal plate ring l having a vulcanized sealing lip 2 and a second L-shaped metal plate ring 3. Become. The axial leg 1' of the first plate ring is contained in the housing 4, and the axial leg 3' of the second plate ring is arranged on the shaft 5. The sealing between the metal plate ring 1 and the housing 4 takes place via a vulcanized plastic covering layer 2'. The second metal plate ring 3 is provided with a sealing coating 6 on the flanks of the leg 3', so that a gas-tight closure with respect to the shaft 5 is achieved.

In order to prevent the sealing coating 6 from being scraped off when the metal plate ring 3 is assembled, a radial projection 7 is integrally formed at the inner end of the leg 3'. During assembly, this protrusion increases the diameter of the leg 3', which leg is provided with a sealing coating 6.

Only when the projection 7 engages in the groove 8 of the shaft 5 can the sealing coating 6 be applied to the shaft 5 and close any possible gaps here. After fitting the protrusion 7 into the groove 8,
Furthermore, the metal plate ring 3 is fixed on the shaft 5 in the axial direction.

FIG. 2 shows a dense piece similar to FIG.

In this case, not only the simple sheet metal part 3 is provided with a sealing coating 6, but also the other sheet metal part 9 is provided with a sealing coating 6 on the axial side 9'. In this case too, a radial projection 7 is provided which engages in a groove 8.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an mm piece according to the present invention, and FIG. 2 is a partial sectional view of a modification of FIG. 1. 3... Metal plate ring 3/, 9/... Leg, 4... Housing, 5... Shaft, 6... Sealing coating, 7... Projection, 8... Groove, 9・・・Metal plate part Auf Akchen

Claims (1)

[Scope of Claims] 1. Partial cross section is approximately L-shaped, and 2. Relatively movable.
In a sealing piece consisting of two annular metal plate parts, at least one part having a sealing lip and both parts each having a plastic coating in the seating area, the at least one plastic coating has a sealing coating (6
) and provided with a projection (7) at the inner end of the axially oriented leg (3', 9') of the annular metal plate part (3, 9) and provided with a sealing coating (6). A sealing piece characterized in that the protrusion is engaged in a groove (8) of the opposite part (5, 4). 2. Sealing piece according to claim 1, characterized in that the sealing coating (6) has a thickness that is less than the height of the projection (7).